JP3637754B2 - Chair armrest device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an armrest device for a chair, and more particularly to an armrest device for a chair whose height can be adjusted.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has already been provided an armrest portion whose height can be adjusted by extending a support portion rising from a seat portion or a leg portion of a chair. And as the height adjustment mechanism of the armrest part, the support part is formed of a support arm and a lifting body, and a cylindrical lifting body attached to the armrest part is arranged on the upper part of the support arm so as to be movable up and down. A vertical hole is formed along the central portion of the upper part of the arm, and an engagement recess is formed at a predetermined interval at the front edge of the vertical hole, and the operation lever is moved back and forth in the opening formed in the front part of the lifting body. The upper and lower ends are pivotally mounted so as to be pivotable, and the operating lever is elastically biased in the protruding direction, and the engaging recess is formed in the free end of the operating lever or a portion that rotates integrally with the operating lever. Some of them are formed by fixing or holding an engaging pin that engages with the.
[0003]
However, the conventional armrest height adjustment mechanism is designed to receive a downward load acting on the armrest with an engaging pin via an operating lever pivotally attached to the lifting body, or a horizontally long shape formed on the inner surface of the lifting body. In most cases, the groove is received by an engaging pin having both ends engaged with the groove. In the former case, the strength of the pivoting part of the operating lever is required, so it is usually necessary to pivot using a metal support shaft. There is a problem that the control lever rattles when vertical force is applied. On the other hand, in the latter case, in order to form a horizontally elongated groove on the inner surface of the lifting body, it is necessary to divide the lifting body into left and right parts. In addition to the time and effort required for assembling, there is a problem in strength because the load on the armrest portion is received at the point contact portion between the engagement pin and the laterally long groove.
[0004]
[Problems to be solved by the invention]
In view of the above-described situation, the present invention intends to solve an engagement pin that engages and disengages with respect to the engagement recess of the support portion in conjunction with the operation of the operation lever in the height adjustment mechanism of the armrest portion. It can be held in the lifting body without backlash, and the load acting on the armrest is distributed and received to increase the support strength, and the lifting body can be integrally molded to make assembly work simple and manufactured. The object is to provide an armrest device for a chair that can be reduced in cost and excellent in appearance.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an armrest device for a chair in which the height of an armrest portion can be adjusted with respect to a support portion rising from a seat portion or a leg portion, and the support portion includes a support arm and a lifting body. A cylindrical elevating body attached to an armrest on the upper part of the support arm is arranged to be movable up and down, and a vertical hole is formed along the center part of the support plate extended to the upper end part of the support arm. In addition, engaging recesses are formed at regular intervals on the front edge of the vertical hole, and an opening is formed at a position corresponding to the support plate at the front part of the elevating body. And a pair of actuating members that slidably move back and forth between the engaging pins that penetrate the engaging recesses or the vertical holes from the front and rear. An elastic body is arranged between the actuating member and the wall of the elevator body and elastically biased forward, The free end of the operating lever pivotally mounted front and rear pivotally vertically one end in the opening and constitutes the armrest apparatus chair made in contact with the actuating member of said outer.
[0006]
Specifically, the actuating member is a U-shaped member in plan view in which a leg plate is bent on both sides of the connecting plate, and the outer actuating member and the inner actuating member are opposite to each other in an inlay relationship. And the support plate is disposed between the connecting plates and the leg plates of the two operating members, and at least the two leg plates of the outer operating member are rearwardly opened long grooves that receive the engaging pins. Is formed. The elastic body may be a compression coil spring disposed between the connecting plate of the inner working member and a wall of the elevating body. Further, it is preferable that the operation lever is integrally formed of a synthetic resin, and an elastic piece is formed on the back surface of the operation lever so as to be in pressure contact with the connecting plate of the outer operation member.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 shows a chair according to the present invention, FIGS. 2 to 8 show the main parts of the present invention, in which 1 is a leg of the chair, 2 is a seat, 3 is a backrest, and 4 is an armrest device. Reference numeral 5 denotes a support portion, and 6 denotes an armrest portion.
[0008]
The armrest device 4 according to the embodiment of the present invention is capable of adjusting the height of the armrest portion 6 with respect to the support portion 5 standing up from the seat portion 2 or the leg portion 1, adjustable in the vertical angle, laterally movable, and laterally adjustable. Is provided. However, since the armrest device 4 of the present invention is characterized by the height adjustment mechanism, it is not essential whether the armrest portion 6 can be adjusted in the vertical and horizontal directions and the horizontal angle.
[0009]
The support portion 5 includes a support arm 7 and a lift body 8. A hollow cylindrical lift body 8 that is attached to the armrest portion 6 and is opened up and down is mounted on the top of the support arm 7 fixed to the seat portion 2. It has a structure that is movably fitted. A height adjusting mechanism is provided between the support arm 7 and the lifting body 8 to adjust the height of the lifting body 8 with respect to the support arm 7 and to maintain the height.
[0010]
The height adjustment mechanism will be described in more detail with reference to FIGS. The height adjusting mechanism is formed with a vertical hole 10 along the center portion of the support plate 9 extending to the upper end of the support arm 7 and is formed at the front edge of the vertical hole 10 with an engagement recess 11 at regular intervals. ..., the opening 12 is formed at a position corresponding to the support plate 9 at the front portion of the elevating body 8, and the guide portion 13 extending in the front-rear direction is formed in the interior facing the opening 12. A pair of actuating members 15 and 16 for holding both end portions of the engaging pin 14 penetrating the engaging recess 11 or the vertical hole 10 from the front and rear are provided in the guide portion 13 so as to be slidable in the front and rear directions, and inwardly operated. An operation lever 19 having an upper and lower end pivotally mounted in the opening 12 so as to be able to rotate back and forth is provided by disposing an elastic body 18 made of a compression coil spring between the member 16 and the inner wall 17 of the elevating body 8. This free end is in contact with the outer actuating member 15.
[0011]
The support arm 7 is made of synthetic resin in which a metal support plate 9 is insert-molded in the center of the upper end portion, and the lower end portion is vertically erected by screwing to both side portions of the seat portion 2. .
[0012]
The elevating body 8 is made of synthetic resin and is integrally formed. The elevating body 8 has a cylindrical structure opened up and down, and is a horizontal partition plate 20 corresponding to the lower edge of the opening 12 at the upper and lower central portion. The partition plate 20 is formed with an insertion hole 21 through which the support plate 9 can be inserted into the central portion and a free end portion of an operation lever 19 described later can be locked. A vertical plate 22 that is shorter than the vertical dimension of the opening 12 is formed on the front side facing the front, and a partition plate 23 parallel to the partition plate 20 is provided at the inner height at the same height as the lower end of the vertical plate 22. And forming a guide portion 13 extending in the front-rear direction to hold the pair of actuating members 15 and 16 slidably in the front-rear direction with the lower partition plate 20 and the lower ends of the upper partition plate 23 and the vertical plate 22. Yes. Thus, by integrally forming the lifting / lowering body 8, the joint between the molded members disappears on the outer surface, and the appearance is excellent.
[0013]
Further, an angle adjusting block body 24 to be described later is fixed in the upper end portion of the elevating body 8, and the lower surface of the block body 24 is set flush with the lower surface of the partition plate 23 and the lower end of the vertical plate 22. Therefore, the guide portion 13 is reinforced. The block body 24 is formed with a slide hole 25 that slidably receives the support plate 9 therein. Further, the structure in which the block body 24 is fixed to the lifting / lowering body 8 is configured such that a claw piece 27 provided at the lower end of the front surface of the block body 24 is retained in a locking hole 26 provided in the vertical plate 22 and is blocked. A bearing portion 28 projecting from the rear upper end of the body 24 is fitted between a pair of holding pieces 29, 29 provided at the upper rear end of the elevating body 8, and a shaft hole 30 provided in the holding pieces 29, 29 is provided. 30 and a shaft hole 31 provided in the bearing portion 28 are used as a common hole, and a support shaft 32 that pivotally supports the armrest portion 6 so as to be vertically rotatable is inserted and connected.
[0014]
The actuating members 15 and 16 are formed by bending a metal plate, and are U-shaped members in plan view in which leg plates 34 and 34 are bent on both sides of the connecting plate 33, as shown in FIG. The outer (front) actuating member 15 and the inner (rear) actuating member 16 can be fitted in such a manner that the leg plates 34 and 34 can be moved back and forth in an inlay relationship in opposite directions. In the present embodiment, both leg plates 34, 34 of the inner actuation member 16 are loosely inserted between both leg plates 34, 34 of the outer actuation member 15. Both actuating members 15 and 16 are provided in the guide portion 13 so as to hold the support plate 9 between the connecting plates 33 and 33 and between the leg plates 34 and 34. At least the leg plates 34, 34 of the outer actuating member 15 are formed with long grooves 35, 35 that are open rearward to receive the engaging pins 14. In this embodiment, the long plates 35 and 35 opened forward are also formed in both leg plates 34 and 34 of the inner working member 16.
[0015]
The operation lever 19 is made of synthetic resin and is integrally formed. Support pieces 36 and 36 are formed on the inner surface side of the upper end portion. Each support piece 36 is formed with a shaft hole 37 and is positioned closer to the inner side of the lower end. Protruding pieces 38, 38 are formed on the front edge of the insertion hole 21 to be retained and locked, and further, an elastic piece 39 is formed on the back surface to press-contact the connecting plate 33 of the outer operating member 15. In the structure in which the operation lever 19 is attached to the opening 12 so as to be able to rotate back and forth, a pair of left and right receiving plates 40, 40 are provided at the front upper and lower center portions of the block body 24. Shaft holes 37, 37 formed in both support pieces 36, 36 of the operation lever 19 are rotatably fitted to the projecting shafts 41, 41 formed on the outer surface side. Prior to the fitting between the projecting shaft 41 and the shaft hole 37, the projecting pieces 38 are positioned in the insertion hole 21. Here, a U-shaped groove 42 is formed around the receiving plate 40 provided with the projecting shaft 41 so that the projecting shaft 41 and the shaft hole 37 can be fitted only by pushing the operating lever 19 from the front side. The projecting shaft 41 is made elastic, and a slope 43 is formed in the front portion of the projecting shaft 41. The inclined surface 43 may be formed inside the distal end portions of the support pieces 36 and 36 of the operation lever 19.
[0016]
The uppermost engaging recess 11 of the support plate 9 is opened forward by a communication groove 44 so that the engaging pin 14 can be inserted from the front. The communication groove 44 may be located at any of the engagement recesses 11..., But it is preferable to provide the communication groove 44 at the uppermost stage because a decrease in strength of the support plate 9 can be minimized. Further, the opening of each engaging recess 11 is chamfered into a taper shape, and a guide when the engaging pin 14 engages with the engaging recess 11 and an engaging pin when the support plate 9 moves up and down. 14 escapes can be made.
[0017]
The elastic piece 39 is not limited to the compression coil spring described above, and may be employed as long as it has an elastic repulsive force against compression made of synthetic rubber or other materials having the same function as the elastic piece 39. It is.
[0018]
In order to assemble the armrest device 4 according to the present invention, the block body 24 is first attached to the upper portion of the elevating body 8 as described above. The armrest portion 6 is attached to the upper end portions of the elevating body 8 and the block body 24. It does not matter whether they are connected or not. Next, the elastic body 18 and the inner working member 16 are inserted into the guide portion 13 from the front side of the opening 12 inside. In this state, it is inserted from below the lifting body 8 from the support plate 9 of the support arm 7 and is positioned through the insertion hole 21 so that the communication groove 44 is at the center of the guide portion 13. Then, with the engagement pin 14 held in the long grooves 35, 35 of the outer operation member 15 from the front side of the opening 12, the operation member 15 is inserted into the guide portion 13 and the engagement pin 14 is inserted into the communication groove. 44. Then, while inserting into the guide portion 13 from the projecting pieces 38, 38 at the lower end of the operation lever 19 and engaging with the insertion hole 21, the upper portion is pushed into the opening 12 to form both support pieces 36, 36. Assembling is completed by fitting the shaft holes 37, 37 to the projecting shafts 41, 41 projecting from the two receiving plates 40, 40 of the block body 24. In the assembled state, the elastic piece 39 of the operating lever 19 presses the connecting plate 33 of the outer operating member 15, and the engaging pin 14 is moved into the engaging recess 11 against the elastic biasing force of the elastic body 18 forward. It is pushed in a little until it is located. When the communication groove 44 is not provided, the long groove 35 of the inner working member 16 is opened downward, and the engagement pin 14 is inserted into the engagement recess 11 of the support plate 9 or the lower end of the vertical hole 10. In this state, the outer actuating member 15 is inserted from the front side of the opening 12 in a state in which it is inserted from below the lifting body 8 and brought into contact with the actuating member 16, and the engaging pin 14 is inserted into the long grooves 35, 35. It accepts within.
[0019]
When adjusting the height of the armrest portion 6, as shown in FIG. 7, if the lower portion of the operation lever 19 is pushed into the opening 12, it further resists the elastic biasing force of the elastic body 18. When the engagement pin 14 is pushed in and reaches the position of the vertical hole 10, the height can be adjusted by holding the armrest 6. Here, the operating lever 19 can be pushed in until the elastic piece 39 on the back surface contacts the vertical plate 22, but in this state, the engaging pin 14 is as shown in FIG. A part is set so as to be located in the engaging recess 11. If the armrest 6 is held and moved up and down, as shown in FIG. 8 (b), the engagement pin 14 pushes the inner working member 16 against the elastic biasing force of the elastic body 18 while pushing the vertical hole. 10, and when it reaches the position of the next engaging recess 11, a part thereof is engaged into the engaging recess 11 by the elastic biasing force of the elastic body 18. Thus, if the armrest portion 6 is moved up and down while pushing the operating lever 19, the engagement recesses 11 and the engagement pins 14 are repeatedly engaged and disengaged, so that the hand holding the armrest portion 6 has a click feeling. As it feels and a clicking sound is generated, the height of the armrest 6 can be easily adjusted. Moreover, it is possible to absorb the variation of the dimension of each member. When the armrest portion 6 reaches a predetermined height, if the finger is released from the operation lever 19, the engagement pin 14 is engaged with any of the engagement recesses 11 by the elastic biasing force of the elastic body 18 forward, The set height is maintained. In this state, the inner actuating member 16 pushes the engagement pin 14 forward by the elastic biasing force of the elastic body 18 to be elastically engaged with the engagement recess 11, and the protruding pieces 38, 38 of the operation lever 19 are inserted. Since the elastic piece 39 is set so as to be in contact with the hole 21 and to be in a slightly compressed state, the outer operating member 15 is pressed against the engaging pin 14 by the elastic force of the elastic piece 39, and each member is rattled. Stable without.
[0020]
Further, a load is applied to the armrest portion 6, that is, the load is supported from the lifting body 8 through the guide portion 13, both actuating members 15 and 16, the engagement pin 14, the engagement recess 11, and the support plate 9. Even if the operation lever 19 is pushed while being transmitted to the arm 7, the load applied to the armrest portion 6 is large, and both the operating members 15, 16 and the guide portion 13 are more than the elastic restoring force of the elastic piece 39. When the frictional resistance force between them is large, it is safe because the elastic pin 39 is only elastically deformed and the engagement pin 14 is not detached from the engagement recess 11. When the load applied to the armrest portion 6 is small, that is, when the force applied to the armrest portion 6 is weak, the operating members 15 and 16 are moved by pushing the operating lever 19 strongly, and the engagement recess 11 Even if the engagement pin 14 is disengaged, there is no danger.
[0021]
Finally, the vertical angle adjustment mechanism and the horizontal movement and horizontal angle adjustment mechanism of the armrest 6 will be briefly described with reference to FIGS. The vertical angle adjusting mechanism connects the tilting member 45 attached in the armrest 6 to the rear upper end of the elevating body 8 constituting the support portion 5 so as to be vertically tiltable by the horizontal support shaft 32 as described above. The central portion of the pivot member 46 having a letter-like shape in a side view is pivotably attached to the front portion of the tilt member 45, and the inside of the armrest portion 6 is attached to the lower surface of the operation rod 47 extending forward of the pivot member 46. The control lever 48 pivotally attached to the rear is brought into contact with the upper surface of the central portion, the operation portion 49 of the operation lever 48 is exposed from the operation hole 50 opened in the lower surface of the front portion of the armrest portion 6, and the block body 24 is exposed. A plurality of engaging recesses 52 are formed on the front edge of the rack member 51 fixed to the front upper end of the front surface of the rack member 51, and the engagement member 52 is engaged with the tip of the operating rod 53 extending downward from the rotating member 46. The mating pin 54 can be engaged with the engaging recess 52. A further said pivoting member 46 engaging pin 54 formed by elastically urged in the direction of rotation to engage the engaging recess 52 structure.
[0022]
Further, the horizontal movement and lateral angle adjustment mechanism of the armrest 6 is attached to the inner upper surface of the armrest 6 through sliders 56 and 56, respectively, with horizontal holding plates 55 and 55 provided at the front and rear ends of the tilting member 45, respectively. The plate 57, 57 is mounted so as to be laterally movable, and a guide groove 58 is provided in the width direction of the inner upper surface of the armrest 6, and a click member 59 is movably fitted along the guide groove 58, and the click In this structure, a rotary shaft 60 protruding below the member 59 is rotatably fitted in a circular hole 61 in the center of the upper surface of the tilting member 45. That is, the armrest portion 6 can be horizontally adjusted with the rotation axis 60 as a center, and the armrest portion 6 is moved laterally to the left and right by sliding the guide groove 58 with respect to the click member 59. It can be made.
[0023]
【The invention's effect】
The armrest device for a chair according to the present invention configured as described above can hold the engagement pin that engages and disengages with respect to the engagement recess of the support portion in conjunction with the operation of the operation lever without rattling. The load applied to the armrest can be dispersed and received to increase the support strength, and the lifting body can be integrally molded, so that the assembly work is simple and the manufacturing cost can be reduced, and the appearance is also improved. It is possible to improve.
[Brief description of the drawings]
FIG. 1 is a side view of a chair to which an armrest device of the present invention is applied.
FIG. 2 is a longitudinal sectional view of the armrest device.
FIG. 3 is an exploded perspective view of essential parts.
FIG. 4 is a partially enlarged longitudinal sectional view showing a state where an armrest portion is adjusted to the lowest level.
FIG. 5 is a partially enlarged vertical sectional view showing a state in which an armrest portion is raised.
FIG. 6 is a cross-sectional view of the main part of the armrest device.
FIG. 7 is a partial longitudinal sectional view of the main part of the same.
FIG. 8 is a simplified explanatory diagram for explaining a click feeling at the time of height adjustment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Leg part 2 Seat part 3 Backrest part 4 Armrest apparatus 5 Support part 6 Armrest part 7 Support arm 8 Lifting body 9 Support plate 10 Vertical hole 11 Engagement recessed part 12 Opening 13 Guide part 14 Engagement pin 15 Actuation member 16 Actuation member 17 Inner wall 18 Elastic body 19 Operation lever 20 Partition plate 21 Insertion hole 22 Vertical plate 23 Partition plate 24 Block body 25 Sliding hole 26 Locking hole 27 Claw piece 28 Bearing portion 29 Holding piece 30 Shaft hole 31 Shaft hole 32 Shaft 33 Connecting plate 34 Leg plate 35 Long groove 36 Supporting piece 37 Shaft hole 38 Protruding piece 39 Elastic piece 40 Receiving plate 41 Protruding shaft 42 U-shaped groove 43 Slope 44 Communication groove 45 Tilt member 46 Rotating member 47 Operating rod 48 Operating lever 49 Operating portion 50 Operation hole 51 Rack member 52 Engaging recess 53 Operating rod 54 Engaging pin 55 Holding plate 56 Slider 57 Mounting plate 58 Guide groove 59 Click member 60 Rotation 61 circular hole

Claims (4)

An armrest device for a chair in which an armrest portion is adjustable in height with respect to a support portion rising from a seat portion or a leg portion, wherein the support portion is formed of a support arm and a lifting body, and an armrest portion is formed on an upper portion of the support arm. A cylindrical lifting body attached to the support arm is arranged so as to be vertically movable, a vertical hole is formed along the center portion of the support plate extended to the upper end portion of the support arm, and the front edge of the vertical hole is formed at regular intervals. An engagement recess is formed, an opening is formed at a position corresponding to the support plate at the front of the lifting body, and a guide portion extending back and forth is formed in the interior facing the opening. A pair of actuating members that hold both end portions of the engaging pin penetrating the engaging recess or the vertical hole from the front and rear are provided to be slidable back and forth, and an elastic body is disposed between the inner working member and the wall of the elevator body. The upper and lower ends are elastically biased forward and turnable back and forth within the opening. Armrest apparatus chair, characterized in that the free end of the pivotally mounted to the operating lever becomes in contact with the actuating member of said outer. The actuating member is a U-shaped member in plan view in which a leg plate is bent on both sides of the connecting plate, and the outer actuating member and the inner actuating member can be moved back and forth in an inlay relationship with each other in opposite directions. And the support plates are disposed between the connecting plates and the leg plates of the two operating members, and at least the two leg plates of the outer operating member are formed with long grooves opened rearward to receive the engaging pins. The armrest device for a chair according to claim 1. The armrest device for a chair according to claim 1 or 2, wherein the elastic body is a compression coil spring disposed between the connecting plate of the inner working member and a wall of the elevating body. 4. The armrest device for a chair according to claim 1, wherein the operation lever is integrally formed of a synthetic resin, and an elastic piece is formed on the back surface of the operation lever so as to be in pressure contact with the connecting plate of the outer operation member.

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